Are methane-belching microbes on Mars hiding underground?

View larger. | Perspective view from Mars Express of the transition region between Acidalia Planitia and Tempe Terra in the northern hemisphere of Mars. A new study suggests that the deep subsurface beneath Acidalia Planitia might be the best place to search for Martian life, existing in the form of methane-belching microbes on Mars. Image via ESA/ DLR/ FU Berlin/ G. Neukum (CC BY-SA 3.0 IGO).

• Is there life on Mars? If so, it is likely microbial and deep below the surface, where temperatures...